Abstract
BackgroundThe American Joint Committee on Cancer (AJCC) staging system (8th edition) for prostate cancer has been published. The current study seeks to validate the prognostic performance of the changes in the new system among clinically staged prostate cancer patients registered within the surveillance, epidemiology and end results (SEER) database.MethodsSEER database (2004–2014) has been accessed through SEER*Stat program and AJCC 7th and 8th edition stages were calculated utilizing T, N and M stages as well as baseline prostatic specific antigen (PSA) and grade group. Cancer-specific and overall survival analyses according to 6th, 7th and 8th editions were conducted through Kaplan-Meier analysis. Moreover, multivariate analysis was conducted through a Cox proportional hazard model.ResultsA total of 110499 patients with prostate cancer were identified in the period from 2004-2014.For cancer- specific survival according to 8th AJCC, all pair wise P values for comparison were significant (<0.01) except for stage IIA vs. IIB; while for overall survival according to 8th AJCC, all pair wise P values for comparison were significant (<0.02) except for stage IIIA vs. IIIB. Results of c-index assessment for cancer-specific survival for the three AJCC editions were as follows: c-index for AJCC 6th edition was 0.816; c-index for AJCC 7th edition was 0.897; c-index for AJCC 8th edition was 0.907. For stage IVB prostate cancer (i.e.M1 disease), further sub-staging was proposed according to M1 sub-stage (i.e. M1a, M1b and M1c). Pair wise comparison between these proposed sub-stages was conducted for both cancer-specific and overall survival. For both cancer-specific and overall survival, all pair wise P values for comparisons were <0.0001.ConclusionCompared to older staging systems (6th and 7th), the 8th system is more discriminatory. Further sub-classification of stage IV disease is suggested.
Highlights
Prostate cancer is the 2nd most cancer among men and the 4th most common cancer in both sexes.Approximately 1.1 million patients were diagnosed with prostate cancer in 2012 according to globocan[1]
The current study seeks to validate the prognostic performance of the changes in the new system among clinically staged prostate cancer patients registered within the surveillance, epidemiology and end results (SEER) database
For cancer- specific survival according to 8th American Joint Committee on Cancer (AJCC), all pair wise P values for comparison were significant (
Summary
The American Joint Committee on Cancer (AJCC) staging system (8th edition) for prostate cancer has been published. The current study seeks to validate the prognostic performance of the changes in the new system among clinically staged prostate cancer patients registered within the surveillance, epidemiology and end results (SEER) database
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